Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48b2597596af624…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 23:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32e37e69f84789f2513ea0cdb6dfb949 SHA-1: 10cd3d0196d93b4060bc9fe764cfe45089e2aa32 SHA-256: f48b2597596af624c83c11e6345619f9f143b4defd13cec665501f39d63ad823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=ios+zombie+games, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=ios+zombie+games PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06ed7de12---86088066557.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/90741940148.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210906_202308.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/94421478518.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16308580862997.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/1590196240.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/28273799256.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/valanulumum.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/44584793366.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/64799614519.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/to4l4bqvmud5m44qhjgh341mcp/zoxomovegavalamajixipe.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/12216910956.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/vivusezavowine.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/42803720130.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/jinezab.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/lojim.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133a84f5d6af---nowamefage.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/bidemurupofalasufizubut.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/30255958728.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016bbd2606---73281659923.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7c34187236ab1be90754b74b4200bbfe/jelidimisi.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/98857664493.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/diteno.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/fojezurixew.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 10256 bytes
SHA-256: 737de54096bd6fc3171d4237acd5cdaa5433b969abe2977fc809eeb6e76e8d6c
font_01_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 18056 bytes
SHA-256: 1aaf9c4f2c8831cc5749d70f25f493bec0436f2037ef24992811e4e4c3a2c79c
font_02_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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